Got you! I pressed play and started the game, went through the intro and walked around and interacted with everything I could before putting on the gas mask, and then went outside. Up until that point everything was clearly visible and sound effects were heard clearly. At that point I went straight outside and everything was black but I could still hear the movement sound effects when I walked around. I just deleted and redownloaded the game and went straight to the mask and outside and there was no glitch! So maybe theres just a bug trigger with the fridge or the save points? Though in either attempt I didn't make a save file!